Mbh 5.51.1d

It was this Bhima who, having entered of old, with Vasudeva’s aid, the innermost apartments of Jarasandha, overthrew that king endued with great energy; that lord of Magadha, the mighty Jarasandha, having fully brought under his subjection the goddess Earth, oppressed her by his energy. That the Kauravas in consequence of Bhishma’s prowess, and the Andhakas and the Vrishnis in consequence of their policy, could not be subjugated by him was due only to their good fortune. What could be more wonderful than that the heroic son of Pandu, of mighty arms and without any weapons, having approached that king, slew him in a trice? Like a venomous snake, whose poison hath accumulated for years, Bhima will, O Sanjaya, vomit in battle the poison of his wrath upon my sons! Like the foremost of the celestials, the great Indra, smiting the Danavas with his thunderbolt, Bhimasena will, mace in hand, slay all my sons! Incapable of being withstood or resisted, of fierce impetus and powers, and with eyes of a coppery hue, I behold even now that Vrikodara falling upon my sons. Without mace or bow, without car or coat of mail, fighting with his bare arms only, what man is there that can stand before him? Bhishma, that regenerate Drona, and Kripa the son of Saradwat,--these are as much acquainted as I myself with the energy of the intelligent Bhima. Acquainted with the practice of those that are noble, and desirous of death in battle, these bulls among men will take their stand in the van of our army. Destiny is everywhere powerful, especially in the case of a male person, for beholding the victory of the Pandavas in battle, I do not yet restrain my sons. These mighty bowmen of mine, desirous of treading in that ancient track leading up to heaven, will lay down their lives in battle, taking care, however, of earthly fame. O child, my sons are the same to these mighty bowmen as the Pandavas are to them, for all of them are grandsons of Bhishma and disciples of Drona and Kripa.